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132 | vana | 1 | # |
2071 | jermar | 2 | # Copyright (c) 2001-2004 Jakub Jermar |
132 | vana | 3 | # All rights reserved. |
4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
29 | ## very low and hardware-level functions |
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30 | |||
2613 | jermar | 31 | # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error |
32 | # word and 1 means interrupt with error word |
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33 | #define ERROR_WORD_INTERRUPT_LIST 0x00027d00 |
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132 | vana | 34 | |
35 | .text |
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36 | |||
37 | .global paging_on |
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38 | .global enable_l_apic_in_msr |
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39 | .global interrupt_handlers |
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1288 | jermar | 40 | .global memcpy |
41 | .global memcpy_from_uspace |
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42 | .global memcpy_from_uspace_failover_address |
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43 | .global memcpy_to_uspace |
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44 | .global memcpy_to_uspace_failover_address |
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132 | vana | 45 | |
1288 | jermar | 46 | |
47 | #define MEMCPY_DST 4 |
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48 | #define MEMCPY_SRC 8 |
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49 | #define MEMCPY_SIZE 12 |
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50 | |||
51 | /** Copy memory to/from userspace. |
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52 | * |
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53 | * This is almost conventional memcpy(). |
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54 | * The difference is that there is a failover part |
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55 | * to where control is returned from a page fault |
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56 | * if the page fault occurs during copy_from_uspace() |
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57 | * or copy_to_uspace(). |
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58 | * |
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59 | * @param MEMCPY_DST(%esp) Destination address. |
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60 | * @param MEMCPY_SRC(%esp) Source address. |
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61 | * @param MEMCPY_SIZE(%esp) Size. |
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62 | * |
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63 | * @return MEMCPY_SRC(%esp) on success and 0 on failure. |
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64 | */ |
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65 | memcpy: |
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66 | memcpy_from_uspace: |
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67 | memcpy_to_uspace: |
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2613 | jermar | 68 | movl %edi, %edx /* save %edi */ |
69 | movl %esi, %eax /* save %esi */ |
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1288 | jermar | 70 | |
71 | movl MEMCPY_SIZE(%esp), %ecx |
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2613 | jermar | 72 | shrl $2, %ecx /* size / 4 */ |
1288 | jermar | 73 | |
74 | movl MEMCPY_DST(%esp), %edi |
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75 | movl MEMCPY_SRC(%esp), %esi |
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76 | |||
2613 | jermar | 77 | rep movsl /* copy whole words */ |
1288 | jermar | 78 | |
79 | movl MEMCPY_SIZE(%esp), %ecx |
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2613 | jermar | 80 | andl $3, %ecx /* size % 4 */ |
1288 | jermar | 81 | jz 0f |
82 | |||
2613 | jermar | 83 | rep movsb /* copy the rest byte by byte */ |
1288 | jermar | 84 | |
85 | 0: |
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86 | movl %edx, %edi |
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87 | movl %eax, %esi |
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2613 | jermar | 88 | movl MEMCPY_SRC(%esp), %eax /* MEMCPY_SRC(%esp), success */ |
1288 | jermar | 89 | ret |
90 | |||
91 | /* |
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92 | * We got here from as_page_fault() after the memory operations |
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93 | * above had caused a page fault. |
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94 | */ |
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95 | memcpy_from_uspace_failover_address: |
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96 | memcpy_to_uspace_failover_address: |
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97 | movl %edx, %edi |
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98 | movl %eax, %esi |
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2613 | jermar | 99 | xorl %eax, %eax /* return 0, failure */ |
1288 | jermar | 100 | ret |
101 | |||
132 | vana | 102 | ## Turn paging on |
103 | # |
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104 | # Enable paging and write-back caching in CR0. |
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105 | # |
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106 | paging_on: |
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2613 | jermar | 107 | movl %cr0, %edx |
108 | orl $(1 << 31), %edx # paging on |
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109 | # clear Cache Disable and not Write Though |
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110 | andl $~((1 << 30) | (1 << 29)), %edx |
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316 | jermar | 111 | movl %edx,%cr0 |
132 | vana | 112 | jmp 0f |
113 | 0: |
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114 | ret |
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115 | |||
116 | |||
117 | ## Enable local APIC |
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118 | # |
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119 | # Enable local APIC in MSR. |
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120 | # |
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121 | enable_l_apic_in_msr: |
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122 | movl $0x1b, %ecx |
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123 | rdmsr |
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2613 | jermar | 124 | orl $(1 << 11), %eax |
125 | orl $(0xfee00000), %eax |
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132 | vana | 126 | wrmsr |
127 | ret |
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128 | |||
1100 | palkovsky | 129 | # Clear nested flag |
130 | # overwrites %ecx |
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131 | .macro CLEAR_NT_FLAG |
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132 | pushfl |
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133 | pop %ecx |
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2613 | jermar | 134 | and $0xffffbfff, %ecx |
1100 | palkovsky | 135 | push %ecx |
136 | popfl |
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137 | .endm |
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132 | vana | 138 | |
139 | ## Declare interrupt handlers |
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140 | # |
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141 | # Declare interrupt handlers for n interrupt |
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142 | # vectors starting at vector i. |
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143 | # |
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144 | # The handlers setup data segment registers |
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576 | palkovsky | 145 | # and call exc_dispatch(). |
132 | vana | 146 | # |
1278 | palkovsky | 147 | #define INTERRUPT_ALIGN 64 |
132 | vana | 148 | .macro handler i n |
958 | jermar | 149 | |
2613 | jermar | 150 | .ifeq \i - 0x30 # Syscall handler |
151 | pushl %ds |
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152 | pushl %es |
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153 | pushl %fs |
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154 | pushl %gs |
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1100 | palkovsky | 155 | |
2613 | jermar | 156 | # |
157 | # Push syscall arguments onto the stack |
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158 | # |
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159 | # NOTE: The idea behind the order of arguments passed in registers is to |
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160 | # use all scratch registers first and preserved registers next. |
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161 | # An optimized libc syscall wrapper can make use of this setup. |
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162 | # |
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163 | pushl %eax |
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164 | pushl %ebp |
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165 | pushl %edi |
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166 | pushl %esi |
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167 | pushl %ebx |
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168 | pushl %ecx |
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169 | pushl %edx |
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1100 | palkovsky | 170 | |
171 | # we must fill the data segment registers |
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2613 | jermar | 172 | movw $16, %ax |
173 | movw %ax, %ds |
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174 | movw %ax, %es |
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1100 | palkovsky | 175 | |
2784 | jermar | 176 | cld |
1100 | palkovsky | 177 | sti |
2613 | jermar | 178 | # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) |
179 | call syscall_handler |
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1100 | palkovsky | 180 | cli |
2613 | jermar | 181 | addl $28, %esp # clean-up of parameters |
1100 | palkovsky | 182 | |
2613 | jermar | 183 | popl %gs |
184 | popl %fs |
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185 | popl %es |
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186 | popl %ds |
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1100 | palkovsky | 187 | |
188 | CLEAR_NT_FLAG |
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189 | iret |
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190 | .else |
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1008 | jermar | 191 | /* |
1021 | jermar | 192 | * This macro distinguishes between two versions of ia32 exceptions. |
193 | * One version has error word and the other does not have it. |
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194 | * The latter version fakes the error word on the stack so that the |
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195 | * handlers and istate_t can be the same for both types. |
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1008 | jermar | 196 | */ |
2613 | jermar | 197 | .iflt \i - 32 |
1021 | jermar | 198 | .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST |
1100 | palkovsky | 199 | /* |
200 | * With error word, do nothing |
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1021 | jermar | 201 | */ |
202 | .else |
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203 | /* |
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204 | * Version without error word, |
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205 | */ |
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206 | subl $4, %esp |
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207 | .endif |
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208 | .else |
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209 | /* |
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210 | * Version without error word, |
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211 | */ |
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212 | subl $4, %esp |
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1100 | palkovsky | 213 | .endif |
214 | |||
2613 | jermar | 215 | pushl %ds |
216 | pushl %es |
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217 | pushl %fs |
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218 | pushl %gs |
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132 | vana | 219 | |
1100 | palkovsky | 220 | #ifdef CONFIG_DEBUG_ALLREGS |
2613 | jermar | 221 | pushl %ebx |
222 | pushl %ebp |
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223 | pushl %edi |
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224 | pushl %esi |
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1100 | palkovsky | 225 | #else |
2613 | jermar | 226 | subl $16, %esp |
1100 | palkovsky | 227 | #endif |
2613 | jermar | 228 | pushl %edx |
229 | pushl %ecx |
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230 | pushl %eax |
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1100 | palkovsky | 231 | |
132 | vana | 232 | # we must fill the data segment registers |
2613 | jermar | 233 | movw $16, %ax |
234 | movw %ax, %ds |
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235 | movw %ax, %es |
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132 | vana | 236 | |
2784 | jermar | 237 | cld |
238 | |||
1100 | palkovsky | 239 | pushl %esp # *istate |
240 | pushl $(\i) # intnum |
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241 | call exc_dispatch # excdispatch(intnum, *istate) |
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2613 | jermar | 242 | addl $8, %esp # Clear arguments from stack |
132 | vana | 243 | |
1100 | palkovsky | 244 | CLEAR_NT_FLAG # Modifies %ecx |
245 | |||
2613 | jermar | 246 | popl %eax |
247 | popl %ecx |
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248 | popl %edx |
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1100 | palkovsky | 249 | #ifdef CONFIG_DEBUG_ALLREGS |
2613 | jermar | 250 | popl %esi |
251 | popl %edi |
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252 | popl %ebp |
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253 | popl %ebx |
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1100 | palkovsky | 254 | #else |
2613 | jermar | 255 | addl $16, %esp |
1100 | palkovsky | 256 | #endif |
257 | |||
2613 | jermar | 258 | popl %gs |
259 | popl %fs |
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260 | popl %es |
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261 | popl %ds |
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132 | vana | 262 | |
2613 | jermar | 263 | addl $4, %esp # Skip error word, no matter whether real or fake. |
316 | jermar | 264 | iret |
1100 | palkovsky | 265 | .endif |
132 | vana | 266 | |
1100 | palkovsky | 267 | .align INTERRUPT_ALIGN |
2613 | jermar | 268 | .if (\n- \i) - 1 |
269 | handler "(\i + 1)", \n |
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132 | vana | 270 | .endif |
271 | .endm |
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272 | |||
273 | # keep in sync with pm.h !!! |
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2613 | jermar | 274 | IDT_ITEMS = 64 |
1100 | palkovsky | 275 | .align INTERRUPT_ALIGN |
132 | vana | 276 | interrupt_handlers: |
277 | h_start: |
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1100 | palkovsky | 278 | handler 0 IDT_ITEMS |
132 | vana | 279 | h_end: |
280 | |||
281 | .data |
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282 | .global interrupt_handler_size |
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283 | |||
2613 | jermar | 284 | interrupt_handler_size: .long (h_end - h_start) / IDT_ITEMS |